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Stock-Based Compensation and Retirement Plans (Details) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Discretionary contribution to share based compensation expense		$ 4,700,000
Proceed from issue of shares under employee stock purchase plans	1,702,000	1,505,000
Non Qualified Stock Option [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Issuance of Non-Qualified Stock Options		1,019,000
Option vested, Period	Over 3 years
Option expires, years	In 10 years
Compensation expense	2,500,000	4,700,000
Restricted Stock [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		177,000
Option vested, Period	Over 3 years
Compensation expense	4,300,000	5,800,000
Restricted Stock Units [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Option vested, Period	Within 30 days
Compensation expense	900,000	1,000,000
Performance Share Units [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		30,000
Compensation expense	2,300,000	6,600,000
Performance period of PSU grant, years	3 year
Performance measures for participants	If the participant has met specified continued service requirements, the PSUs will settle in cash or a combination of cash and up to 50% of equivalent value in the Company’s common stock, at the discretion of the compensation committee
Portion of equivalent value in common stock of company after meeting service requirements, at discretion of compensation committee	50.00%
Current liability	3,300,000		6,000,000
Long-term liability	6,400,000		7,000,000
Amount paid to employees for settlement	2,800,000	6,400,000
Issue of common stock to employees	67,300
Employee Stock Purchase Plan [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Compensation expense	400,000	300,000
Common stock reserved for issuance	1,250,000
Proceed from issue of shares under employee stock purchase plans	1,700,000	1,500,000
Issue of shares under employee stock purchase plans	57,000	80,000
Deferred Compensation [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Employee Deferral to Non-Qualified Deferred Compensation Plan	up to 75% of their base salary, up to 100% of their bonus, and up to 100% of the cash portion of their PSU compensation to the plan
Maximum portion of base salary to defer under non-qualified deferred compensation plan	75.00%
Maximum portion of bonus to defer under non-qualified deferred compensation plan	100.00%
Maximum of cash portion of PSU compensation to defer under non-qualified deferred compensation plan	100.00%
Non Employee Deferral To Non-Qualified Deferred Compensation Plan	Defer up to 100% of their cash compensation paid by the Company to the plan. Additionally, participating directors may defer up to 100% of the shares of common stock.
Maximum portion of Cash compensation paid by company to defer under non-qualified deferred compensation plan	100.00%
Maximum portion of shares of common stock to defer under non-qualified deferred compensation plan	100.00%
Supplemental Executive Retirement Plan [Member]
Stock Based Compensation and Retirement Plans (Textual) [Abstract]
Compensation expense, supplemental executive retirement plan	$ 1,400,000	$ 5,400,000